Lab report names starting with C

Abbreviations

• % CD19CD19+ B Cells, percentThe share of your lymphocytes that are B cells. B cells are the white blood cells that grow into antibody-making cells.
• c-ANCAc-ANCA (cytoplasmic) TiterA microscope test for antibodies that make a type of white blood cell glow in a cytoplasmic pattern. It is mostly linked to PR3 antibodies and to a vasculitis called GPA.
• C-pepC-PeptideC-peptide is released along with insulin, so it shows how much insulin your own pancreas is making, even if you take insulin.
• C1-INH AgC1 Esterase Inhibitor, antigenic (protein level)The amount of C1 inhibitor protein in your blood. A low level is one clue in the testing for hereditary angioedema.
• C1-INH FxC1 Esterase Inhibitor, functionalHow well your C1 inhibitor protein works, shown as a percent of normal. A low result is a key clue in testing for hereditary angioedema.
• C1INH FunctionC1 Esterase Inhibitor, functionalHow well your C1 inhibitor protein works, shown as a percent of normal. A low result is a key clue in testing for hereditary angioedema.
• C1INHqC1 Esterase Inhibitor, antigenic (protein level)The amount of C1 inhibitor protein in your blood. A low level is one clue in the testing for hereditary angioedema.
• C282YHFE C282YA DNA test for the most common gene change behind hereditary hemochromatosis, a condition where the body absorbs too much iron. Having two copies does not always lead to iron overload.
• C3Complement C3The most abundant complement protein in your blood. Complement is part of the immune system, and C3 sits at its center.
• C3cComplement C3The most abundant complement protein in your blood. Complement is part of the immune system, and C3 sits at its center.
• C4Complement C4A protein in the complement system, part of your immune defense. Low or high levels are read together with C3 and your symptoms.
• C677TMTHFR C677TA gene test for a very common MTHFR variant that slightly lowers how your body handles folate. Medical groups advise against routine testing for clots.
• CaCalcium, TotalTotal calcium is the amount of calcium in your blood. It supports your nerves, muscles, heart and bones, and it is on most routine panels.
• CA 15-3CA 15-3 (Cancer Antigen 15-3)A protein on breast and other gland cells. Doctors use it to follow breast cancer treatment, and many harmless conditions can raise it too.
• CA 19-9CA 19-9 (Cancer Antigen 19-9)A sugar-and-protein molecule that some digestive-system cancers release. Many harmless bile duct, liver and pancreas conditions raise it too.
• Ca totalCalcium, TotalTotal calcium is the amount of calcium in your blood. It supports your nerves, muscles, heart and bones, and it is on most routine panels.
• CA-125CA-125 (Cancer Antigen 125)A protein made by tissue lining the pelvis and belly. Doctors mainly use it to follow ovarian cancer, and many harmless conditions raise it too.
• Ca/CrUrine Calcium-to-Creatinine RatioCalcium in one urine sample compared with creatinine, which adjusts for how dilute the urine is. It is used for stone and bone work-ups in adults and children.
• Ca2+Calcium, IonizedIonized calcium is the free, active part of the calcium in your blood. It is checked when total calcium or protein levels make the usual test hard to read.
• cBase(B)Base Excess (Base Deficit)A calculated number showing extra acid or base in your blood, apart from breathing. A negative value is a base deficit.
• CBCComplete Blood Count (CBC) Without DifferentialLab panelRed cells, hemoglobin, hematocrit, red cell indices, total white cell count and platelets.
• CblVitamin B12 (Cobalamin)Measures the vitamin B12 in your blood. Your nerves and red blood cells need B12, so this is the usual first check of your B12 status.
• CBZCarbamazepine (Total)Measures how much carbamazepine (Tegretol), a seizure and nerve-pain medicine, is in your blood.
• cCaCalcium, Corrected for AlbuminCorrected calcium adjusts your total calcium for a low or high albumin level, to estimate what total calcium would be with a typical amount of albumin.
• CCMHMean Corpuscular Hemoglobin Concentration (MCHC)How concentrated the hemoglobin is inside your red blood cells, which shows how pale or dense they are.
• CCPAnti-CCP (Cyclic Citrullinated Peptide) AntibodyMeasures antibodies against citrullinated proteins. A positive result is closely linked to rheumatoid arthritis and can appear years before joint symptoms.
• CcrCreatinine Clearance (24-Hour Urine)Compares creatinine in a 24-hour urine collection with creatinine in your blood to estimate how much blood your kidneys clear each minute.
• Cd/CrCadmium/Creatinine Ratio, UrineCadmium in a urine sample divided by the creatinine in the same sample. This evens out how watery the urine is and mainly reflects long-term exposure.
• CD3 %CD3+ T Cells, percentThe share of your lymphocytes that are T cells, which carry a marker called CD3. The absolute count is usually more useful.
• CD3 pctCD3+ T Cells, percentThe share of your lymphocytes that are T cells, which carry a marker called CD3. The absolute count is usually more useful.
• CD4 %CD4+ T Helper Cells, percentThe share of your lymphocytes that are CD4+ T helper cells. It is read together with the CD4 count.
• CD4 absCD4+ T Helper Cells, absoluteThe number of CD4+ T helper cells in a microliter of blood. These white blood cells help direct your immune response.
• CD4 pctCD4+ T Helper Cells, percentThe share of your lymphocytes that are CD4+ T helper cells. It is read together with the CD4 count.
• CD4/CD8CD4/CD8 RatioCD4 helper T cells divided by CD8 cytotoxic T cells. It shows how those two groups of T cells balance.
• CD8 %CD8+ T Cells, percentThe share of your lymphocytes that are CD8+ T cells. It is read together with the CD8 count and the CD4 results.
• CD8 absCD8+ T Cells, absoluteThe number of CD8+ T cells in a microliter of blood. These cytotoxic cells destroy infected or damaged cells.
• CD8 pctCD8+ T Cells, percentThe share of your lymphocytes that are CD8+ T cells. It is read together with the CD8 count and the CD4 results.
• CdBCadmium, BloodMeasures cadmium, a toxic metal, in whole blood. It mostly reflects recent exposure, and smoking is the most common reason for a higher result.
• CdUCadmium, UrineMeasures cadmium, a toxic metal, in a urine sample. It mostly reflects how much has built up in the body over years.
• CdU/CrCadmium/Creatinine Ratio, UrineCadmium in a urine sample divided by the creatinine in the same sample. This evens out how watery the urine is and mainly reflects long-term exposure.
• CEACEA (Carcinoembryonic Antigen)A protein that some cancers release, mainly colorectal. It is used to follow people with cancer, not to screen healthy people.
• CENP-BAnti-Centromere B (CENP-B) AntibodyMeasures antibodies against CENP-B, a protein at the center of chromosomes. They are linked to limited systemic sclerosis (CREST) and, in some people, to primary biliary cholangitis.
• CENP-B AbAnti-Centromere B (CENP-B) AntibodyMeasures antibodies against CENP-B, a protein at the center of chromosomes. They are linked to limited systemic sclerosis (CREST) and, in some people, to primary biliary cholangitis.
• cFAIFree Androgen Index (FAI)A calculated estimate of how much testosterone is free to act, found by dividing total testosterone by SHBG.
• cfDNANIPT Aneuploidy Screen (Cell-Free DNA)A prenatal blood test that estimates the chance that a baby has an extra copy of chromosome 21, 18 or 13. It is a screening test, not a diagnosis.
• cFTTestosterone, FreeThe small part of your testosterone that isn't attached to proteins. Results depend heavily on the lab method, so compare only with a range for the same method.
• CHCMMean Corpuscular Hemoglobin Concentration (MCHC)How concentrated the hemoglobin is inside your red blood cells, which shows how pale or dense they are.
• cHCO3Bicarbonate (HCO3-), Blood GasThe bicarbonate your blood gas analyzer calculates from pH and pCO2. It shows the kidney-controlled side of acid-base balance.
• CHOLTotal CholesterolThe total amount of cholesterol in your blood, counting HDL, LDL and VLDL together. It is one piece of the lipid panel.
• Chol/HDLTotal Cholesterol / HDL RatioYour total cholesterol divided by your HDL ("good") cholesterol. Some labs print it as a single number that sums up your cholesterol balance.
• CHrReticulocyte Hemoglobin Content (CHr / Ret-He)How much hemoglobin is in your newest red blood cells, in picograms (pg). It reflects the iron available to your bone marrow over the last few days.
• CKCreatine Kinase (CK), TotalAn enzyme found mostly in muscle. It leaks into the blood when muscle is strained or injured, so hard exercise is a common reason for a high result.
• ClChlorideChloride is a salt mineral in your blood. It works with sodium to balance fluids and acid, and it is part of the basic and comprehensive metabolic panels.
• CMPComprehensive Metabolic Panel (CMP)Lab panelGlucose, kidney function, electrolytes, calcium, proteins, bilirubin and liver enzymes.
• CMV Ab IgGCytomegalovirus (CMV) IgGA blood test for antibodies that show whether your immune system has met cytomegalovirus (CMV), a very common virus, at some point in your life.
• CMV Ab IgMCytomegalovirus (CMV) IgMLooks for IgM antibodies that often appear early in a new CMV infection, but can also stay positive for months or come back falsely positive.
• CMV IgGCytomegalovirus (CMV) IgGA blood test for antibodies that show whether your immune system has met cytomegalovirus (CMV), a very common virus, at some point in your life.
• CMV IgMCytomegalovirus (CMV) IgMLooks for IgM antibodies that often appear early in a new CMV infection, but can also stay positive for months or come back falsely positive.
• CO2Bicarbonate (Total CO2)Bicarbonate, often printed as CO2 or total CO2, gives a clue about your body's acid-base balance. It is part of most routine blood panels.
• COCUrine Cocaine Metabolite (Benzoylecgonine) ScreenA urine screen for benzoylecgonine, the main breakdown product of cocaine. It shows recent exposure, usually over the past few days.
• COHbCarboxyhemoglobin (COHb)The share of your hemoglobin that is bound to carbon monoxide instead of oxygen. It shows recent carbon monoxide exposure, including from smoking.
• Cor a 14Cor a 14 (hazelnut) IgEMeasures IgE to Cor a 14, a hazelnut storage protein. It is more often found in people who react to eating hazelnut.
• Corr CaCalcium, Corrected for AlbuminCorrected calcium adjusts your total calcium for a low or high albumin level, to estimate what total calcium would be with a typical amount of albumin.
• CORTCortisolThe main stress hormone made by your adrenal glands. It follows a daily rhythm, so the time of your blood draw matters when reading the result.
• CPKCreatine Kinase (CK), TotalAn enzyme found mostly in muscle. It leaks into the blood when muscle is strained or injured, so hard exercise is a common reason for a high result.
• CPK-MBCK-MBA heart-muscle form of the enzyme creatine kinase. It was long used to look for heart muscle injury, and troponin has now mostly replaced it.
• CREACreatinineCreatinine is a muscle waste product that your kidneys filter out, so the level in your blood is one of the main tools for checking kidney function.
• CRPC-Reactive Protein (CRP, incl. hs-CRP)A protein your liver makes when the body has inflammation. Standard CRP helps check for infection or injury, and hs-CRP is used in heart-risk checks.
• CsACyclosporine (Trough)Measures how much cyclosporine, an anti-rejection and immune-calming medicine, is in your blood just before your next dose.
• CST3Cystatin CA small protein that nearly every cell makes and the kidneys clear from the blood, used to check kidney filtration without depending on muscle mass.
• CT NAAChlamydia trachomatis NAATA urine test that looks for the genetic material of the bacteria that cause chlamydia, a common sexually transmitted infection.
• CT NAATChlamydia trachomatis NAATA urine test that looks for the genetic material of the bacteria that cause chlamydia, a common sexually transmitted infection.
• CTLCD8+ T Cells, absoluteThe number of CD8+ T cells in a microliter of blood. These cytotoxic cells destroy infected or damaged cells.
• cTnITroponin I (Cardiac, incl. High-Sensitivity)A protein released when heart muscle cells are damaged. Doctors use it to find out whether the heart muscle has been injured, most often when someone has chest pain.
• cTnTTroponin T (Cardiac, incl. High-Sensitivity)A protein released when heart muscle cells are damaged. Doctors use it to find out whether the heart muscle has been injured, most often when someone has chest pain.
• CTXCTX (C-Telopeptide of Type I Collagen), SerumA blood marker of how fast old bone is being broken down. It is mostly used to follow osteoporosis treatment, not to screen healthy people.
• CTX-ICTX (C-Telopeptide of Type I Collagen), SerumA blood marker of how fast old bone is being broken down. It is mostly used to follow osteoporosis treatment, not to screen healthy people.
• CuCopperThe total amount of copper in your blood, most of it carried by a liver protein called ceruloplasmin. It helps show whether you have too little or too much copper.
• CYACyclosporine (Trough)Measures how much cyclosporine, an anti-rejection and immune-calming medicine, is in your blood just before your next dose.
• CysCCystatin CA small protein that nearly every cell makes and the kidneys clear from the blood, used to check kidney filtration without depending on muscle mass.